Ignition indicator



June 9, 1931. A. H. GIUSTI IGNITION INDICATOR Original Filed Nov. 18. 1929 I 344mm fl. H Qiu/SZz' Yen-a. @OWWO point trouble.

Patented June 9, 1931 Unite STATES PATENT OFFICE" I ATTELIO HENRY GIUSTI, or 'PHILADELrI-I A, PENNSYLVANIA IGNITION m'm moa v Application filed November 18, 1829, Serial No. 408,117. Renewed February 7, 19 31.

-' is operating properly or improperly.

The invention is lntended primarily foruse with machines having twin ignition systems, in which one set of spark plugs is fed from one coil by means of abreaker and distributor, while the other set of plugs is similarly fed by means of a second coil and a second distributor and breaker, the two distributors and breakers being commonly embodied in one unitary construction. When used in connection with such a system, it may be determined at any time whether the primary circuit for either set of plugs is functioning properly or improperly, and the invention is of particular advantage in locating breaker- With the foregoing inview, the invention resides in the novel subject matter hereinafter described and claimed, description be-' ing accomplished by reference to the accompanying drawings.

Fig. 1 is an elevation of an ignition indicator constructed in accordance with my invention, for use upon a twin ignition system.

Fig. 2 is a vertical sectional view on line 22 of Fig. 1.

Fig. 3 is a diagram showing the manner in which the indicator is connected with atwin ignition system. p

The drawings above briefly'described 11lus-,

' trate the preferred form of construction and while such constructlon Wlll be herein specifian opening in said board. Mounted upon the panel 5, are two ignition indicating units U, but as the constructions of both are identical, only one will be described.

The unit U embodies two L-shaped members 6, each having an elongated threaded shank 7 and a lateral head 8. The two shanks 7 pass through openings 9 in the panel and are provided with shoulders 10 which abut the frontside of said panel, said shoulders being preferably in the form of nuts threaded upon the shanks. threaded upon these shanks, abut the rear side of the panel 5 and thus secure the two members 6 rigidly to said panel.

Threaded into the heads 8 and projecting Clamping nuts 11 also beyond the outer ends of these heads, are two electrodes 12 whichare spaced apart to provide a spark gap 18. A transparent tube 14 surrounds the projecting portions of the electrodes 12 and .is held in place by recesses 15. formed in the outer ends of the heads 8, said recesses snugly receiving the ends of said tube.

Binding posts 16 are threaded shanks 7 and have their inner ends in contact into the I with the electrodes 12, while their outer ends project beyond said shanks and are provided with wlre clamping nuts 17.

In connecting the indicator with a twin ignition system, the usual high tension leads nected with the coils C,are connected for instance with the lowermost of the four binding posts 16, and the portions of the leads passing on to the distributor and breaker unit D, are connected with the other two of saidbinding posts. Thus, each time high tension current flows through the ignition system, a flash or spark is created at the spark gapsl Hence, at a glance, the driver of thevehicle may determine whether the current feeding means for one set of plugs or the other, or both, are operating properly or improperly. The invention is of particular advantage in locating breaker-point trouble, although by failure to show a flash or spark at the gap 13, will also indicate any other ignition trouble which may be causing the plugs to miss. 7

I claim I 1. In an ignition indicator, a support having two spaced openings, two L-shaped members each having a threaded shank and a lateral head, said shanks passing through said openings and having shoulders abutting one side of said support, nuts threaded on said shanks and abutting the other sides of said support, electrodes projecting from the outer ends of said lateral heads and spaced apart to provide a spark gap, and binding posts in conducting relation with said electrodes and projecting beyond the free ends of said shanks.

2. A structure as specified in claim 1; to-

gether with a transparent tube surrounding said electrodes, said outer ends of said heads having recesses snugly receiving the ends of said tube.

In testimony whereof I have hereunto affixed my signature, v

ATTILIO HENRY GIUSTI. 

